בראשית כג:יב פירוש: רשב״ם, ספורנו, רד״ק וRav Hirsch

וישתחו אברהם, to Efron before the assembled people.

Avraham bowed. He bowed to them to acknowledge that it was in their honor that Ephron consented.

וישתחו, Avraham bowed to Efron in everybody’s presence.